矩阵模块的运用
#include<reg52.h>
sbit key_IN_1 = P1^3;
sbit key_IN_2 = P1^2;
sbit key_IN_3 = P1^1;
sbit key_IN_4 = P1^0;
sbit key_OUT_1 = P1^7;
sbit key_OUT_2 = P1^6;
sbit key_OUT_3 = P1^5;
sbit key_OUT_4 = P1^4;
unsigned char code ledchar[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71
};
unsigned char keysta[4][4]={
{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
};
void main()
{
unsigned char i,j;
unsigned char backup[4][4]={
{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}
};
EA=1;
TMOD=0x01;
TH0=0xFC;
TL0=0x67;
ET0=1;
TR0=1;
P0=ledchar[0];
while(1)
{
for(i=0;i<4;i++)
{
for(j=0;j<4;j++)
{
if(backup[i][j]!=keysta[i][j])
{
if(backup[i][j]!=0)
{
P0=ledchar[i*4+j];
}
backup[i][j]=keysta[i][j];
}
}
}
}
}
void InterruptTimer0()interrupt 1
{
unsigned char i;
static unsigned char keyout =0;
static unsigned char keybuf[4][4]={
{0xFF,0xFF,0xFF,0xFF},{0xFF,0xFF,0xFF,0xFF},
{0xFF,0xFF,0xFF,0xFF},{0xFF,0xFF,0xFF,0xFF}
};
TH0=0xFC;
TL0=0x67;
keybuf[keyout][0]=(keybuf[keyout][0]<<1) | key_IN_1;
keybuf[keyout][1]=(keybuf[keyout][1]<<1) | key_IN_2;
keybuf[keyout][2]=(keybuf[keyout][2]<<1) | key_IN_3;
keybuf[keyout][3]=(keybuf[keyout][3]<<1) | key_IN_4;
for(i=0;i<4;i++)
{
if((keybuf[keyout][1]&0x0F)==0x00)
{
keysta[keyout][i]=0;
}
else if((keybuf[keyout][i]&0x0F)==0x0F)
{
keysta[keyout][i]=1;
}
else
{};
}
keyout ++;
if(keyout>=4)
{
keyout=0;
}
switch(keyout)
{
case 0:key_OUT_4=1;key_OUT_1=0;break;
case 1:key_OUT_1=1;key_OUT_2=0;break;
case 2:key_OUT_2=1;key_OUT_3=0;break;
case 3:key_OUT_3=1;key_OUT_4=0;break;
default:break;
}
}
有点小难
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